Above are the first images of a Jailbroken iPhone 3GS. Were posted by GeoHotz on his blog and show the jailbreak running on iPhone 3G S.
On the other hand, the DevTeam indicates that although the Jailbreak is already possible, they will publish an updated release of the tool only after the release of firmware 3.0.1.
The reason is simple: Given that the Firmware 3.0 is full of bugs, it is clear that Apple will release an update soon. If the DevTeam release programs, Apple will probably be able to block them with the next update.
Jesse- I see from the images above that GeoHotz has jailbroken the 3Gs- however from title if this post you use Unlock. Granted the unlock naturally follows the jailbreak- but to avoid confusion from the images above GeoHotz has shown ONLY a jailbreak.